Machine for contouring crown-matrices.



F. 0. JAQUES, JR-

' MACHINE FOR GONTOURING GROWN MATRICES.

APPLICATION FILED OUT. 27, 1908.

932, 1 33. Patented Aug. 24. 1909.

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F. 0. JAQUES, JR. MACHINE FOR GONTOURING GROWN MATRICES. APPLICATIONFILED OUT. 27, 1908.

932, 1 33 Patented Aug. 24, 1909.

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ATTDRNEY.

UNITED STATES PATENT OFFICE FERNANDO 0. J'AQUES, IR., OF CRANSTON, RHODEISLAND, ASSIGNOR TO CENTRAL TOOL COMPANY,

A CORPORATION OF RHODE ISLAND.

MACHINE FOR GONTOURING CROWN-MATRICES.

' in forming a matrix having an orifice conforming in contour to theexterior of the natural tooth, and of such increased dimensions as tocompensate for the thickness of the wall of the crown blank, to be laterplaced therein and operated upon. To perform these functions quickly,and accurately is the primary purpose of the present invention.

A further object is to provide means for adjusting the mechanism toincrease or decrease the dimensions of the orifice according to thethickness of the particular crown blank wall to be manipulated; also topro vide means for adjusting both the flask and the operating rodrelatively to each other.

Other advantages will later be adverted to incidental to the subjoineddescription, and will be claime l.

The invention consists in a machine for performing the above functions;also in the novel construction and operation of the several and combinedparts thereof.

In the accompanying drawings which constitute a part of thespecification, Figure 1 is a side elevation of a machine embodying myinvention, Fig. 2, a section of the same on line w w of Fig. 1, Fig. 3,a bottom plan View of the crank disk, Fig. l, a section of the machineon line 00 a: of Fig. 1, Figs. 5 and 6, sections on lines y y and z .2respec tively of Fig. 1, Fig. 7, a side elevation of the tooth model,Fig. 8, a like elevation of the same within the matrix, the latter beingshown in transverse section, Fig. 9, a like section of the matrix and anunbent blank therein, Fig. 10, a like section of the same after theinternal swaging operation, and Fig. 11, a perspective view of thecompletely contoured crown.

Specification of Letters Patent.

Application filed October 27, 1908.

Patented Aug. 24:, 1909.

Serial No. 459,699.

Like reference characters indicate like parts throughout the views.

The frame of the machine may be of any form adapted to carry theoperative arts. In the form thereof herein shown, the frame comprises abase, post, and two lateral arms upon the post. The base, 1, is providedwith a longitudinal recess, 2, in its upper face to receive a slidableblock, 8, which is adjustable therein by a set screw, 4, in the side ofthe base. The block or slide, 3, is provided in its upper face with arecess, 6, to receive a flask, 7, which is frictionally engaged by a setscrew, 8, in the end of the slide. The inner face of the flask haspreferably interspaced ti-shaped vertical ribs, 9.

In a socket or bearing, 10, integral with the rear end of the base, 1,is a set screw, 11, engaging a vertical post, 12, loosely mounted in thebearing. Integral with an intermediate portion of the post, or fixedthereto by a screw, 13, is a horizontal arm, 14:. Integral with or fixedto the upper portion of the post is a second horizontal arm, 16, invertical alinement with the arm, 14. A gear, 17, is loosely mounted uponthe upper extremity of the post, and in this instance is held in placeby the head of a vertical screw or pin, 18, in the top of the post. Uponthe upper face of the gear, 17, is an operating handle, 19.

Rotatably mounted in the outer end of the arm, 16, is a cylindrical hub,21, having upon its upper end a retracted portion or stem, 22, whichprojects above the face of the arm, 16, and upon which is fixed by ascrew, 23, or otherwise a gear or pinion, 24:, which meshes with thegear, 17. In this instance, the screw is received in a vertical threadedopening, 25, in the stem portion, 22, of the hub. The lower end of thehub is of increased diameter forming an integral circular disk portion,26, whose upper shoulder, 27, is seated in a recessed portion, 28', inthe lower face of the arm, 16. Obviously the portion, 26, may be anindependent disk fixed in any convenient manner to the hub, 21. The hub,21, is provided off center with a vertical opening, 29, which extends toor communicates with the opening, 25. A crank pin, 31, off center uponthe upper face of a circular crank disk, 32, is frictionally of thelower face of the crank disk, 32, is

provided with a curved cavity, 33, and its periphery is preferablybeveled as at 34. The beveled portion is provided with micrometricgraduations, 35, adapted to register with a graduated index, 36, uponthe lower face of the disk portion, 26, of the hub.

In the arm, 14, is a circular opening, 37, in which is a ring or sleeve,38, sustained by pivot points, 39, fixed in the arm and enteringdiametrically opposite cavities, 40, in the exterior of the ring. Atdiametrically opposite portions of the ring, 38, are fixed pivot points,41, disposed at right angles to the points, 39, entering cavities, 42,in an intermediate portion of a rod, 43, interspaced as at 44 from thering, 38. The described interspaced ring, 38, and pivot pointsconstituting a yielding bearing in the arm, 14, for the rod, 43. Theupper end of the rod or a pin, 45, with a rounded extremity, registersin the cavity, 33, of the crank disk, 32. The lower end of the rod, 43,has mounted thereon by the screw, 47, and adjustable thereby, a sleeve,48, provided with a seat, 49, adapted to receive the base, 50, of atooth form, 51, which base is engaged by a clamping screw, 52, in thesleeve, 48.

The operation and application of the described machine is as follows:The form, 50, 51, of the natural tooth, preferably of plaster of paris,and constructed as is well known in the art, is secured by the screw,52, in the sleeve, 48. The block, 3, with the flask, 7, is slid inbeneath the form and adjusted horizontally with relation thereto by thescrew, The sleeve, 4 8, is then vertically adjusted by screw, 47 tolower the form within the flask the desired distance. Any requiredtransverse adjustment of the form is effected by turning the post, 12,in the sleeve, 10, and clamping the post in such adjusted position bythe screw, 11. Casting metal, 53, is then poured in a fused conditioninto the flask, 7, and the gear, 17, is then rotated by the handle, 19,which turns the pinion, 24, hub 21, and disk 32, thereby imparting aradial oscillating motion to the rod, 43, and to the form during thecooling of the fused metal. The described movement of the form in themetal during its soft plastic condition produces, as shown in Fig. 8, amatrix, 53, having an opening, 59, conforming substantially with thecontour of the form, 51, but of greater lateral dimensions. After thematrix, 53, has cooled, the plaster model, 51, is by any convenientpointed tool manually fractured and the pieces removed from the cavity,59. After withdrawal of the matrix, 53, flask, 7, and block, 3, from thebase 1, a cylindrical seamless crown blank or thimble, 61, is placed inthe opening, 59, of the matrix, as shown in Fig. 9. The blank is thenpartly or completely filled with soft material such as filings, or ablock of wood or rubber, 62, and tamped down to expand or force theblank wall against the sides of the orifice, 59. The flask, 7, is thenreleased by screw, 8, from its seat in block, 3, and the matrix forcedout of the flask and transversely fractured by a hammer or otherwiseleaving the contoured crown, (33, as shown in Fig. 11. The desiredthickness of the crown wall, 61, varies; and in order to accommodate thesize of the matrix to blanks having different wall thicknesses, it isnecessary to vary the size of the opening, 59, to correspond. Thisvariation is effected by the radial throw of the tooth model which isregulated to any desired degree by turning the disk, 32, upon its pin,31, until the graduations, 35, register with the proper graduations ofindex, 36, upon the face of the disk portion, 26, of the hub. Theremoval of the crank disk for adjusting purposes is efiected byintroducing an implement through the openings, 25 and 29, and pressingthe same against the pin.

VJ hat I claim is,

1. In a machine for contouring crown matrices, the combination with aflask for fused metal, of a frame, means mounted in the frame forsupporting a tooth form within the flask, and means upon the frameengaging the supporting means for imparting radially oscillatingmovement to the form supporting means.

2. In a machine for contouring crown matrices, the combination with aflask for fused metal, of a frame means mounted in the frame andradially movable therein for supporting a tooth form within the flask,and means upon the frame for imparting con-. tinuous oscillatingmovement to the supportmg means.

In a machine for contouring crown matrices, the combination with aframe, of a radially movable rod mounted intermediate its length in theframe, means upon the lower end of the rod for holding a tooth form, andmeans in the frame engaging the upper end of the rod for radiallyoscillating the holder.

4. In a machine for contouring crown matrices, the combination with aframe, of a rod pivotally mounted intermediate its length in the frame,means upon one end of the rod for engaging a tooth form, and rotarymeans in the frame engaging the other end of the rod for oscillating therod.

In a machine for contouring crown matrices, a flask for holding fusiblemetal adapted to receive the impression of a tooth form, means invertical alinement with the flask for supporting the tooth form, andmeans for continuously oscillating the supporting .1 .ans.

6. In a machine for contouring crown matrices, the combination with aframe, of a vertical rod pivotally mounted in the frame,

. a tooth form holder upon the end of the rod,

means in the frame engaging the rod for oscillating the holder, a flaskin the frame in vertical alineinent with the holder, and means foradjusting the flask relatively to the holder.

7. In a machine for contouring crown matrices, the combination with aframe, of a vertical red pivotally mounted in the frame, a tooth formholder upon one end of the rod, means in the frame and engaging the rodfor cs illating the holder, and means in the frame engaging theoscillating means for regulating the degree of oscillation of theholder.

8. In a machine for contouring crown matrices, the combination with aframe, of a rod pivotally mounted upon the frame, a tooth form holderupon the rod, means in the frame engaging the rod for oscillating theholder, means in the frame cooperating with the oscillating means forregulating the degree of oscillation of the holder.

9. In a machine for contouring crown matrices, the combination with aframe, of a vertical rod pivotally mounted upon the frame, a tooth formholder upon the lower end of the rod, means in the frame engaging therod for oscillating the holder, means in the frame cooperating with theoscillating means for regulating the degree of oscillation of theholder, a flask slidably mounted in the frame below the holder, andmeans for adjusting the flask horizontally with relation to the holder.

10. In a machine for contouring crown matrices, the combination with aframe, of a vertical rod pivotally mounted upon the frame, a tooth formholder upon the lower end of rod, means in the frame engaging the rodfor oscillating the holder, means in the frame engaging the oscillatingmeans for regulating the degree of oscillation of the holder, a flaskmounted in the frame below the holder, and means in the frame fortransversely adjusting the holder relative to the flask.

11. In a machine for contouring crown matrices, the combination with aframe, of a vertical rod pivotally mounted upon the frame, a tooth formholder upon the lower end of the rod, means in the frame engaging therod for oscillating the holder, means in the frame engaging theoscillating means for regulating the degree of oscillation of theholder, a flask mounted in the frame below the holder, means forhorizontally adjusting the flask relatively to the holder, and meanstransversely adjusting the holder relatively to the flask.

12. In a machine for contouring crown matrices, the combination with aframe, of a vertical rod pivotally mounted upon the frame, a tooth formholder upon the lower end of the rod, means in the frame engaging therod for oscillating the holder, a flask mounted in the frame below theholder, and means for adjusting the flask relatively to the holder.

13. In a machine for contouring crown matrices, the combination with aframe, of a vertical rod pivotally mounted upon the frame, a tooth formholder adjustably mounted upon the lower end of the rod, means in theframe cooperating with the rod for oscillating the holder, a flask inthe frame below the holder and horizontally adjustable with relation tothe holder, and means in the fame for transversely adjust ing the holderrelatively to the flask.

1a. In a machine for contouring crown matrices, the combination with aframe, and flask, of a vertical operating rod pivotally mountedintermediate its length in the frame above the flask, a form holder uponthe lower end of the rod, a crank disk rotatably mounted in the frameengaging the upper end of the rod, and means upon the frame for rotatingthe crank disk.

15. In a machine for contouring crown matrices, the combination with aframe and flask, of a vertical operating rod pivotally mountedintermediate its length in the frame above the flask, a form holder uponthe lower end of the rod, a disk rotatably mounted in the frame andprovided with a cavity in which registers the upper end of the rod, andmeans upon the frame for rotating the crank disk.

16. In a machine for contouring crown matrices, the combination with aframe and flask, of a vertically disposed operating rod pivotallymounted intermediate its length in the frame above the flask, a formholder upon the lower end of the rod, a disk eccentrically and rotatablymounted in the f 'ame engaging the upper end of the rod, and means uponthe frame for rotating the disk.

17. In a machine for contouring matrices, the combination with a frame,of an operating rod pivotally mounted intermediate its length in theframe, a hub rotatably mounted in the frame adjacent the end of the rod,a disk eccentrically mounted in the hub and provided with a cavity inwhich registers the end of the rod, and means upon the frame forrotating the hub.

18. In a machine for contouring matrices, the combination with a frame,of an operating rod yieldingly mounted intermediate its length in theframe, a hub provided with graduations upon its face rotatably mountedin the frame, a disk eccentrically fixed in the hub and resting againstthe face of the hub and provided with peripheral graduations adapted toregister with the graduations upon the hub and provided with a cavity inits face adapted to receive the end of the rod, and means upon the framefor rotating the hub.

19. In a machine for contouring matrices, the combination. with a frame,and an operating rod yieldingly mounted intermediate its length in theframe, of a hub provided with a longitudinal opening rotatably mountedin the frame adjacent the end of the rod a disk upon the lower end ofthe hub and. provided upon its lower face with a cavity adapted toreceive the end or" the rod, a pin upon the upper face of the disk fixedin the longitudinal opening, a pinion fixed to the hub, and a drivinggear upon the hub engaging the pinion.

20. In a machine for contouring matrices, the combination with a base, apost, and a horizontal arm upon the post, of a second horizontal armfixed to the post below the first arm and provided with an opening, aring of less diameter than the opening within the opening, pivot pointsin the arm engaging the periphery of the ring atdiametrically oppositepoints, an oscillatory operating rod of less diameter than the ringtraversing the ring, pivot points in the ring and disposed at an angleto the pivot points first mentioned engaging the rod at diametricallyopposite points, and rotary means in the first arm engaging the end ofthe operating rod for actuating the operating rod.

21. In a machine for contouring matrices, the combinatlon with the baseand flask, of a socket upon the base, an axially movable vertical postmounted in the socket, an ad justing screw in the socket engaging thepost, two horizontal arms fixed to the post in vertical alinement withthe flask, an operating rod yieldingly mounted in one arm, and ii-ieansin the other arm operatively connectcd with the rod for actuating therod.

22. In a machine for contouring crown matrices, the combination with aflask for fused metal, of aframe, means mounted in the frame forsupporting a tooth form within the flask, and means upon the frame forimparting radially oscillating movement to the form supporting means. I

23. In a machine for contouring crown matrices, the combination with aflask for fused metal, of means for supporting a tooth form within theflask, and means for 1n1- parting radially oscillating movement to theform supporting means.

In testimony whereof I have atlixed my signature in presence of twowitnesses.

FERNANDO O. JACQUES, JR. lVitnesses I'IORATIO E. BnLLows, lVAL'nnn LouisFROST.

